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Abstrak :
Young patients with class ll skeletal malocclusion are often found. To avoid further discrepancy of this case, myofunctional therapy is one of the options. Functional appliance often used for such treatment. Functional appliance has been modified since activator was introduced by Andresen. With its bulky shape, activator makes difficulty for patient to speak and eat. Patient unable to wear it full time due to uncomfortness and negative facial appearance. In 1977, Clark developed twin block to overcome the weakness of previous appliances. A more simple design allows patient to be more comfortable and willing to wear it longer. Twin block is myofunctional appliance to reposition the mandible forward for skeletal class Il correction with retruded mandible. This paper describes the design, clinical management effects of twin block treatment and brief case presentation using twin block appliance. Similar to the study reports found, this case revealed improvement of facial appearance, decrease overjet and overbite. improvement of molar relationship and good compliance of patient.

Abstrak :
A 12 years old female presented with class II division I malocclusion with skeletal disorder (ANB 6°), deep bite, posterior crossbite 26, prostrusive of anterior maxillary constriction, retrognatic of mandible and mild crowding of upper and lower jaws. The treatment of choice was twin block appliance for modifying the jaw development, and then followed by fixed orthodontics. After eight months, the progression of treatment was a better facial profile.